AD7495 Ref out Capacitor

Hi

I am considering the AD7495.

The Ref out terminal will not be used.(Internal Ref Use)

It is written to attach a capacitor of at least 100nF in the data sheet.
However, if I don't use the Ref out terminal, is it okay to not attach a capacitor?

Also, if I don't use the Ref out terminal and attach a capacitor smaller than 100nF, is there any problem for AD7495?

Best regards

Yuya